Friction brake mechanism



Juy 27, 1926. c. L.. cz. MAGE@ ET AL,

FRICTION BRAKE MEGHANISM Filed April 6 1925 Patented July 27, i926.

UNITED srATss l I essere@ PATENT orifice.

CHAUNCEY L. C. MGEE AND BENJAMIN S. PFIEIIIIZEFIEIR, 0F CBICAGO,ILLINOIS.

FRICTION BRAKE MECHANISM.

Application filed ApriI 6, 1925.'. Serial No. 20,91.

This invention relates to friction brake mechanism in general, such asthose ordinarily employed on motor vehicles.

Generally stated, the object of the invention is to provide a novel andimproved construction whereby the torque of the rotating element isutilized to develop the power nece'ssary, or some portion thereof, toapply the friction brake mechanism to stop or vretard the rotation ofsaid element.

It is also an object to provide certain details and features ofconstruction and combinations tending to increase the general etlieienoyand the desirability of a self-operating, so to speak, friction brakemechanism of this particular character.

To these and other useful ends, the invention consists in the mattershereinafter set forth and claimed. and shown in the accom`- panyingdrawings iti which,-

Fig. l is a side elevation of a friction brake mechanism embodying theprinciples of the invention.

Fig. 2 is a detail section on line 2-2 in t Fig. 1.

As thus illustrated, the invention comprises the rotating element l, orfriction drum, such as those on the hubs of motor vehicles. The frictionbrake mechanism is all inside of this drum, and comprises the twomembers 2. and 'which are pivoted together at 4, so that they can swingapart, the outer sides ot these members having suitable material forengagement with the inner surface of the flange of the drum (,see Fig.Q) The two members are connected together by 'toggle links 5, and thtoggle joint has a roller 6, Iand a similar roller 7 is mounted on thememben, as shown. A loose or floating friction member 8 is disposedbetween the upper ends of the members 2 and 3, in the manner shown, andis provided with a tail portion 9 disposed between the rollers 6 surfaceof the drum, thus releasing the brake and 7 previously mentioned. Itwill be seen. that this tail portion has an inclined or beveled surfaceat- 10, and a similar one at ll, whereby if the member 8 is shifted tothe lett. the surface l0 will react against the roller 6 and tend tocrowd the t-wo rollers apart, thus causing the toggle joint tostraighten and crowd the members 2 and 3 apart at their upper ends. 0nthe other hand, the member 8 is moved to the right the incline or bevelor cam surface 1l Will react against the roller 6 and cause the tworollers to be crowded apart, thus straightening the toggle and settingIthe brake mem bers Zand 3 forcibly against the inner surw vface `of thedrum.-

clined to move with the drum, in either direction, depending upon whichway the drum is rotating. Such displacement of the member 8 will causethe tail piece 9 to crowd the two rollers 6 and 7 apart, thus straightnching the toggle and causing the members 2 and 3 to exert pressureagainst the inner surface of the drum. Thus the power necessary to pushthe member 8 forcibly against the inner surface of the drum may be comparatively slight, and the necessary braking action is then broughtabout by the utilisation of the torque of the rotating element, so thatthe rotation of the element to be stopped or retarded isreally developedinto power to set the brake mechanism.

'Springs 15 and 16 may be applied, as

shown, to hold the member 8 yieldingly in normal position. It will alsobe understood,

-of course, that the brake mechanism with its prot 4 is suitably mountedon any stationary support, such as the axle housing of the ordinarymotor vehicle, and that the shaft i2 may be supported and operated inany suitable or desired manner, as by means of a foot pedal (not shown)so connected that it will be operative to rotate o r rock the shaft 12sutliciently to raise the member 8 and thereby automatically', so tospeak, set the brake mechanism by means of the'ftorque or rotation ofthe .vehicle wheel'.

It will be seen that the cam 13 when moved downwardly will engage theAmember 8 and press it downwardly away from the inner mechanism.Preferably, this is the normal position of the cam, thereby keeping themember 8 from vibrating and from rubbing against the inner surface ofthe drum.

lVhat We claim as our invention is 1. In friction brake mechanism, arotating ilo seid brake shoe means, said instrumentalities comprising atoggle joint, and means having .o wedging action between said joint and.:i

portion of the brake shoe and whereby felisplacement of said frictionmember by the rotation of said element 1s operative through "said togglejoint to set the brake shoe means against the rot-citing element.

2. In friction broke mechanism, a rotating element, brake .shoe yineensy1n position to operatively engage said element to stop or retard therotation thereof, and bistro-3A mentulities comprising a friction memberfor engaging said rotating element to utilize -tlie torque or rotationthereof to 'operate seid brake .shoe Ineens, 'said broke shoe Ineenscomprising two shoes pivoteu together et one -end and sepjaietecl attheir other ends,

and said .instrumentolities comprising n, toggle joint connectionbetween the separatedends ot tbe shoes, together With eroller on seidtoggle joint7 a similar roller on one of said brake shoes, seid trietionmember llevlng e portion mterpos'ed between said rollers and formed tocrowd seid rollers apart when seid member is moved in either directionby the rotatlon of sei rotating element.

3. In `friction breite mechanism, o mia@ tween the other elements andoperutetlby said iisplacement to set the brake mechanism.

4. The combination of o. drum, friction shoes pivotecl together andformed to engage the drum, a friction member between the ends of saidslices, a, toggle connection between seid ends of the shoes; ineens tooperate seid toggle to push the shoes into engegement with .the drum,operated byeeid member, and means to cause said mem- .ber to engage thedrum, thereby to operate the toggle. i

g Specification Signori' this 80th -day of Merch, 1925'.

oHirUNceY L. ormone. BENJAMIN s. erinnere.

